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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - putImageData leaves visible artifacts on retina display"
href="https://bugs.webkit.org/show_bug.cgi?id=156039">156039</a>
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<th>Summary</th>
<td>putImageData leaves visible artifacts on retina display
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>Canvas
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>bert@freudenbergs.de
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<th>CC</th>
<td>dino@apple.com
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<pre>On a retina display, putImageData leaves gribblies around the affected area's border. Changing the page zoom clears these artifacts, proving that the actual canvas content is correct.
To reproduce I have isolated a simple test case here:
<a href="http://bertfreudenberg.github.io/SqueakJS/test/putImageData.html">http://bertfreudenberg.github.io/SqueakJS/test/putImageData.html</a>
In production this manifests e.g. when trying to move a window here:
<a href="https://bertfreudenberg.github.io/SqueakJS/demo/simple.html">https://bertfreudenberg.github.io/SqueakJS/demo/simple.html</a>
Note that the gribblies do not show up when using pixelated image-rendering:
<a href="https://bertfreudenberg.github.io/SqueakJS/demo/simple.html#pixelated">https://bertfreudenberg.github.io/SqueakJS/demo/simple.html#pixelated</a></pre>
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